This is Dr. Davidbad leg cramps can be from low potassium, dehydration, poor circulation or possibly a pinched nerve in your lower back which can cause pain in your lower back and pain radiating down into your legsyou need to see a GP doctor to get your lower back examined.you might need an xray or an MRI scan of your lower backand blood tests to check on your electrolytes and potassium levelsdo you have a GP primary care doctor?

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